[css-fonts-4][editorial] tweak wording fractionally

Author: svgeesus

css-fonts-4/Overview.bs

@@ -102,7 +102,7 @@ Basic Font Properties</h2>
 
 	The particular font face used to render a character is determined by
 	the font family and other font properties that apply to a given element.
-	This structure allows settings to be varied independent of each
+	This structure allows settings to be varied independently of each
 	other.
 
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